Both have a very wide wind range and go early.
Both will go big.
Very, very different feel.
Screamer is 'highly tuned', almost reminds me of kites from yesteryear.
Evo is much smoother, refined and controlled in its power delivery, but maybe not as exciting until you get into its top third of its range, where most kites start to get fun anyway.
Dimitri is my all time fav rider (not relevant but hey thought I'd chuck that in).
Try Both my man.